Door knocker



FIG. 1 is a front perspective view of a door knocker showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a front perspective view of the door knocker of FIGS. 1-6 with the knocking element shown in a second position;

FIG. 8 is a front perspective view of a door knocker showing an alternative embodiment of my design;

FIG. 9 is a front view thereof;

FIG. 10 is a left side view thereof;

FIG. 11 is a right side view thereof;

FIG. 12 is a top view thereof;

FIG. 13 is a bottom view thereof; and,

FIG. 14 is a front perspective view of the door knocker of FIGS. 8-13 with the knocking element shown in a second position.

The broken line showing of the circular region represents a door viewer that forms no part of the claimed design. 

CLAIM The ornamental design for a door knocker, as shown and described. 